Grain-drill



(No Model.)

S. B.- HART.

GRAIN DRILL. No. 323,327. Patented July 28, 1885..

UulMw/o a k iii/a UNITED STATES PATENT rricn.

STACY B. HART, OF PEORIA, ILLINOIS.

GRAIN-DRILL.

SPECIFICATION forming part of Letters Patent No. 323,327, dated July 28, 1885.

Application filed September 26, 1884. (So model.)

To all whom it may concern:

Be it known that I, STACY B. HART, of the city of Peoria, in the county of Peoria and State of Illinois, have invented certain new and useful Improvements in Grain-Drills, of which the following is a description, reference being had to the accompanying drawing, which is made a part of this specification.

My invention relates to mechanisms for raising and depressing the teeth or hoes of graindrills and other analogous structures; and it consists in a lifting-lever provided with means for shifting the fulcrum, whereby the leverage is increased or diminished as the teeth are depressed into or raised out from the ground.

The drawing represents'a side elevation of a graindrill having a portion of the frame and of the ground-wheels cut away, said grain- (lrill being provided with my improved means for raising and depressing the drill-teeth.

A represents the frame-work of the drill.

B represents the rock-shaft, supported by and capable of revolving in bearings attached to appropriate parts of the frame.

0 represents the hand-lever, the motion of which, through the instrumentality of the short arm Z, rigidly attached to said rock-shaft, and the connecting-link D, causes the rockshaft B to revolve, thereby, through the instrumentality of the lug or arm E, rigidly attached to said rockshat't, and the link 0, raising or depressing the drag-bars F and drillteeth G.

Vith the ordinary hand-lever now in use for raising or depressing the drill-teeth a much greater force is required to force the teeth into the ground than to raise them out from the ground.

In order to more nearly equalize the force required in these two operations, and to make it possible with a comparatively slight force to press the teeth into the ground and to throw a large portion of the weight of the machine onto the teeth, I construct the lever in the manner illustrated in the drawing, to wit: I provide the lever C at its lower end with the longitudinal slot 0', which passes over the pin curved slot, it, one end of which slot approaches nearer to the pin it than does the other end.

A bolt or pin, 0, passes through this sloth, and

is rigidly attached to the lever 0. Now, when this lever O is moved from the position shown in the drawing to the left, the bolt 0, being rigidly fixed to the lever G and moving in the slot 0, will compel the slot 0 to slide down on the pin it, thereby lengthening the lower arm of said lever. It is evident that by this move ment, when the teeth are being lifted from the ground, the lever loses in power, butgains in speed and extent of motion imparted. lVhen this motion is reversed, and the lever 0 passes toward the position illustrated in the drawing, the slot 0 slides up on the pin h, the lower arm of the lever is shortened, and the upper arm lengthened, thereby increasing the leverage, and enabling the operator to easily press the teeth into the ground with great force.

A lever constructed as above described, with means for shifting the fulcrum, thereby increasing or diminishing the leverage at different points in its movement, is applicable not only to a graindrill, but to a variety of other analogous structures, and where a portion of the machine may be raised or lowered by the operator.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

Tl1C0lIlblI|i1llOll,Wltll a lever provided with a longitudinal slot, of a supportingplate provided with a pin which fits into said slot in the lever, and with a curved slot, one end of which is nearer to said pin than the other end, which curved slot receives a pin rigidly at tached to said lever, substantially as and for the purpose specified.

STACY B. HART. lVitnesses:

EMERY S. WALK n12, L. THURSTON. 

